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I \IVI coAuiie R PLASTIC,

UNITED STATES JAMES A. WHEELER,

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PATENT OFFICE;

OF NEW YORK, N. Y.

PROCESS OF MOLDING FIBROUS PULP.

SPECIFICATION forming part of Letters Patent n 625,872, dated Ma 2 1899. Application fina April 20. 1893. Serial in. 678,255. on specimens.)

The object of my prsentinvention is to give more body to the finished product and to increase the solidity thereof by simple and inexpensive means; and to that end the invention consists, essentially, in the addition of ashes and in some cases also tale to the materials employed in'the process described in my said Letters Patent.

The chief materialjn the compound to be treated and molded is fibrous pulp, preferably woodnl except in case where the compound 15 to be fireproof, in which case I use asbestos fiber mixed with pulverized in-- com us 1 0 material, which may be either 2 5 ashes or tale, or both, preferably finely sifted. 1e fibrous material thus produced I moisten with water, preferably of a tem erature near boiling-point, to melt or dissoive other 1n-- grer icn s, hereinafter mentioned, and to ex- 0 pedite the dr in" of the article molded from the compound. 33y this moistening' the pulp is rendered pasty, and I then mix therewith :oghnm gummy or silicate 9i Emtash, which produces a doughy o y, whic is be thor- 5 oughly kneaded and which by exposure to air and heat becomes solidified, and by combining with said doughy body pulverized lime it is caused to solidify as hard as stone and rendered capable of resisting chemical action. 40 \Vhen the finished article is to be white, I

, mix with the aforesaid compound either white lead or zinc-white or slaked quicklime.

By adding puiverize resins or gums to the compound while the latter is -ica ei sum- 5 ciently to melt said resins or-gums a homo- 'iffihiflds' made for that purpose.

geneous mass is obtained, which haruen with a beautiful luster. The compound thus prepared is specially well adapted for forming therefrom bath-tubs and other articles liable to be subjected to alkali-soaps and hot water, which does not affect said compound. This compound is further improved by adding thereto calcined 1 riz d manesite soaked i I [11' u anesiaorsulta eoxis, may besoake orid of magnesia. The 5 5 mixture is to be thoroughly kneaded and then molded in the desired shape 'by means of dies The material is to be allowed to set and harden in the mold, and the molded article may be removed from the mold and baked in a suitable kiln and is thereby hardfimo such a degree-as to allow it to be finished by either a cutting or polishing tool. The molded article may be further hardened by a coat of a solution of 6 chlorid of magnesia or other chlorids applied by a brush or other suitable means.

What I claim as my invention is- 1. The treatment of fibrous pulp by mixing therewithpulverized incombustible material, then moistening the mixture with hot water, then adding to said mixture sodium silicate, then kneading the mass and adding quicklime thereto, then mixing pulverized resins with the mass while heated.

2. The treatment of fibrous pulp by mixing therewith pulverized incombustible material, then moistening the mixture with hot water, then adding to said mixture sodium silicate, then kneading the mass and adding quicklime 8o thereto, then mixing pulverized resins with the mass while heated, then adding to said mass calcined pulverized magnesite soaked in chlorid of magnesia and again kneading the mass and finally molding. it, as set forth.

JAMES A. WHEELER.

Witnesses:

PAUL ARMITAGE, GEORGE I). Munronn. 

